Steam-boiler.



No. 769,754. PATENTED SEPT. 13, 1904 J. R. LOWREY.

STEAM BOILER.

APPLICATION rum) JAN. 5, 1903.

N0 MODEL.

W1 TNESSES:

W-(Di-e/MMM By UNITED STATES Patented September 13, 1904.

PATENT GEEICE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 769,754, dated September 13, 1904.

Application filed January 5,1903. Serial No. 137,981. No modeL Be it known that I, JOHN R. Lownnr, residing at Omaha, in the county of Douglas and State of Nebraska, have invented certain useful Improvements in Steam-Boilers; and I do hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, which forms a part of this specification.

This invention relates to a new and useful improvement in steam-boilers, the aim of my invention being to provide a means to prevent the uneven expansion and contraction of the fine and flue-sheets, as will be described more fully hereinafter.

In the accompanying drawing I have shown asectional view, with portions removed, of one end of a flue-sheet and connected flues, disclosing a broken portion of the baffle-plate as used in my invention.

In boiler construction, especially in that class relating to locomotive-boilers, it-is an exceedingly diflicult matter to prevent the ends of the Hues from becoming detached from the flue-sheet, and so cause a leakage. This is primarily due to the uneven expansion and contraction of the projecting flue ends. In order to prevent this unequal expansion and contraction, I provide the ordinary flue-sheet A, provided with the fines (4 upon the rearthat is, at the end within the fire-box with a baffie-plate B, this plate being secured by means of suitable bolts C, upon which is threaded the conical bur 6, working into a conical seating of the baffle-plate, as shown. The flues a are provided with the usual bead 1 upon the inside and the usual exterior bead 2. To protect the ends of these fiues (1 within the firebox, I provide the baffle-plate B, preferably of a size equal to the inner surface or face of the boiler, and this bathe-plate is provided with a plurality of bushings D, which bushings enter the inner ends of the times a, as shown in the drawing. By this arrangement I provide the boiler with a curtain upon the end within the tire-box, and so provide an airspace In between the bathe-plate and flue-sheet, while the ends of the fines are further shielded and protected by the bushings 1) within the same. These bushings are secured by any suitable means to the baffle-plate B and, if desired, may be beaded into the flue ends a. In actual practice it is found that this space between the flue-sheet A and baffle-plate B becomes tilledwith line cinder particles and ashes, which pack between the plates and form a sort of non-conducting filler between the plate and sheet. If desired, practically the same results may be obtained in permitting a portion,

of the flues u to project and secure to the ends thereof a suitable baffle-plate.

As the baffle-plate and the bushings are required to be renewed it is simply necessary to remove the burs 7) and place a new baffle-sheet, with connected bushings, and possibly replace a bur or two.

\Vhat I desire to secure by United States Letters Patent is- The combination with a boiler provided with the usual flue-sheet and fines, of a perforated bafHe-plate suitably secured adjacent said fluesheet, and a plurality of bushings secured within the perforations of said baffle-plate, said bushings coinciding with and extending into said flues substantially as and for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN R. LO\V REY.

WVitnesses:

GEORGE W. Suns, \VILLIAu E. WINDSOR. 

